Stan Griep, Rural Route 1, Berthoud, believes it will be necessary to go to the mouth of the river up by the Poudre Lakes to find a drinkable glass of water. Mrs. Royal Maxwell, 125 E.

Only a fraction of the Earth's water is drinkable—an estimate from the U.S. Geological Survey puts all of the world's freshwater at just 2.5 percent of the total global water. But much of that ...